“Vertical Horizon” is a photographic journey by French graphic artist Romain Jacquet-Lagreze through the relentlessly dense metropolis of Hong Kong. Depicting a visual record of the sprawling city through vertical upshots of skyscrapers and architecture, the images induce a kind of reverse vertigo, whilst giving a fascinating insight into the city’s atmosphere. The collection is presented in a hardcover book, and here is a selection of what it contains.